VARIATIONAL STUDY ON CORRELATED-SQUEEZED GROUND STATE OF QUANTUM TUNNELING SYSTEM INTERACTING WITH TWO PHONONS
量子隧道系统与两声子库关联压缩基态的变分法研究

The variational approach is applied to the study of the ground state of quantum tunneling system interacting with two phonons by use of a correlated-squeezed transformation. We fine: 1) For the two phonons bath, the ground state energy of the phonons with correlation effect is lower than that without correlation effect; 2) The effect of correlation varies with the mode parameters: In the resonant regime of the phonons and two-state system, the correlation effect is more significant and will be strengthened together with the increase of coupling coefficient.